This P. aureosulcata is completely freeze dried. Most culms have been bent the ground, but I left a few standing to see what would happen. Ugly. I'd say 10% chance for culm survival. I've seen P. aureosulcata listed as hardy to -20f, I'd say that the leaves went at around -10f....

And here is one of the newly plants Ilex opaca. A northern form, the leaves are a dark green (it's a bad pic)... I'm expecting the leaves to drop but, hopefully, it will leaf out again... I've gotta think that these northern forms would experience -20f occasionally in the wild...

Cheers.